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HDD access LED - JP1
JP1 accepts two LED connections, on pins 1&2 or 3&4.
Floppy Enable - JP2
shorted: enable FDD
open: disable FDD
Primary/Secondary IRQ select - JP3
JP3 selects between promary (IRQ14) and secondary (IRQ15) IRQs.
1&2 is primary (default)
2&3 is secondary
I/O port address - JP4
JP4 selects whether the priary or secondary I/O address is used:
1&2 is primary (default: 3F0-3F7, 1F0-1F7)
2&3 is secondary (370-377, 170-177)
BIOS base address
The base address of the firmware is set by these three jumpers:
| Base address | JP5 | JP6 | JP7 |
| C8000 - CBFFF | 2&3 | 2&3 | 1&2 |
| CC000 - CFFFF | 1&2 | 2&3 | 1&2 |
| D0000 - D3FFF | 2&3 | 1&2 | 2&3 |
| D4000 - D7FFF | 1&2 | 1&2 | 2&3 |
| D8000 - DBFFF | 2&3 | 1&2 | 1&2 |
| DC000 - DFFFF * | 1&2 | 1&2 | 1&2 |
* Default.
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